Once upon a time there were three little groups of pigs. No, not those pigs, this is a slightly different world.
In this world, most pigs lived in straw houses. A few pigs had started to figure out that twig houses were an improvement but they were relatively few.
Most of the straw-house pigs were quite happy. Their houses kept them dry most of the time and rarely did the gentle winds in this valley do enough damage to the straw houses to be much of a concern. Of course, it did happen on occasion, but most of those pigs chalked it up to bad luck and re-built their straw houses, though a few did see the wisdom of the twig houses and became Twig Pigs.
The Twig Pigs could not understand how the Straw Pigs could accept their straw houses. The Twig Pigs did what they could to try to tell the straw pigs what kind of trouble could be in store for them. Some did so gently, some were more obnoxious about it. Some even tried to huff and puff on the straw houses to make their point. But alas, pigs cannot blow down houses, that’s a different story.
The Twig Pigs became more strident, warning of an impending storm that would take down all of the straw houses, yet the Straw Pigs didn’t listen and went back to their food and their games. This only frustrated the Twig Pigs, and many of the Twig Pigs eventually gave up trying.
Then one day came a strong and frightful storm. Thunder and lightning, gales and hurricane-force winds whipped the valley. Straw house after straw house was destroyed. And so were the twig houses. The Straw Pigs were too disinterested and the Twig Pigs were too busy trying to convince the Straw Pigs that they failed to notice that a few of the Twig Pigs thought long and hard about their situation and decided to build brick houses. The Brick Pigs were well-protected from the storm, and invited in all of the Straw Pigs and Twig Pigs who could make it to the brick houses.
Once the storm cleared, the valley had no more Straw Pigs and no more Twig Pigs, for they were all now Brick Pigs. The first Brick Pigs had accomplished what the Twig Pigs could not, and then some.